WO2000035194A9 - Method for encoding multiple audio streams - Google Patents
Method for encoding multiple audio streamsInfo
- Publication number
- WO2000035194A9 WO2000035194A9 PCT/US1999/029140 US9929140W WO0035194A9 WO 2000035194 A9 WO2000035194 A9 WO 2000035194A9 US 9929140 W US9929140 W US 9929140W WO 0035194 A9 WO0035194 A9 WO 0035194A9
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- audio
- recited
- audio streams
- streams
- encoded
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
- G11B27/102—Programmed access in sequence to addressed parts of tracks of operating record carriers
- G11B27/105—Programmed access in sequence to addressed parts of tracks of operating record carriers of operating discs
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N9/804—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components
- H04N9/8042—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components involving data reduction
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
- G11B2220/2537—Optical discs
- G11B2220/2545—CDs
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/84—Television signal recording using optical recording
- H04N5/85—Television signal recording using optical recording on discs or drums
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N9/804—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components
- H04N9/806—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components with processing of the sound signal
- H04N9/8063—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components with processing of the sound signal using time division multiplex of the PCM audio and PCM video signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N9/82—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only
- H04N9/8205—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only involving the multiplexing of an additional signal and the colour video signal
- H04N9/8227—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only involving the multiplexing of an additional signal and the colour video signal the additional signal being at least another television signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N9/82—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only
- H04N9/8205—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only involving the multiplexing of an additional signal and the colour video signal
- H04N9/8233—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only involving the multiplexing of an additional signal and the colour video signal the additional signal being a character code signal
Definitions
- the present invention relates generally to methods for encoding and playing back of audio and video information, and, more particularly, to the encoding and playing back of multimedia information combining audio streams, text streams, and video streams.
- an unique video stream is generally combined with one or more audio streams. This is generally the case for all video and audio combinations. For example, for a music video encoded on a Video Compact Disc (“VCD”) or Digital Versatile Disc (“DVD”), one particular music video stream is encoded with a particular audio stream. Upon playback, the video stream is synchronized with the audio stream and played.
- VCD Video Compact Disc
- DVD Digital Versatile Disc
- the conventional method in encoding the video and audio information for one song is to couple the video stream with one or two audio streams and a stream of overlay graphics and/or text ("OGT") to overlay the video stream — all on one track. Therefore, there is generally one song per track. If there are two audio streams, typically, one audio stream contains both the singer's voice as well as the underlying music and the second audio stream would just have the underlying music.
- the stream of OGT information typically would contain words in the languages of choice. However, it must be synchronized with the video stream and the audio stream.
- a method is provided to allow the encoding and playing back of encoded one or more still pictures or video streams with multiple sound streams and overlay graphics and/or text information, thereby allowing a medium (e.g. compact disc) to be encoding with a large number of audio information (e.g. songs).
- a medium e.g. compact disc
- a still picture and multiple sound streams are encoded in such a manner that upon playback of the sound streams the still picture is displayed for all audio information (e.g. songs).
- the OGT information can be optionally encoded or encoded and optionally displayed to provide subtitle or guidance in sing-along situations.
- a huge amount of audio information (and therefore songs) can be stored on a single compact disc.
- at least one video stream can be encoded with multiple audio streams and optional OGT information.
- the single video stream is displayed with a variety of audio streams and the corresponding OGT information. This method minimizes the amount of video information that needs to be stored on the storage medium and thereby allowing a tremendous amount of audio information to be stored on a medium such as a compact disc.
- the present invention is not limited by the particular storage media; it can be a VCD formatted physical disc, a DVD formatted physical disc, or any other physical media. Using the methods of the present invention, over fifty songs can be encoded on a VCD formatted disc.
- An advantage of the present invention is that it provides a method for encoding and playing back of one or more still pictures with multiple audio streams.
- Still another advantage of the present invention is that it provides a method for encoding and playing back of still picture or video and multiple audio streams for sing-along purposes.
- Fig. 1 illustrates the time delay in encoding the audio streams in the preferred embodiment of the present invention.
- Figs. 2a - 2c illustrate the encoding for the various format of the preferred embodiments.
- the methods for encoding of still pictures with multiple audio channels, still pictures with multiple audio channels and multiple OGT information, and video stream with multiple audio channels and multiple OGT sub-streams are disclosed.
- the encoding of video streams and still pictures are performed in accordance with ISO 18318 (MPEG-2), and the encoding of audio streams are performed in accordance with layer II of MPEG- 1 or MPEG-2.
- the system stream contains one or more normal or high resolution still pictures encoded as MPEG video streams and one or more audio channel sub-streams.
- the particular method in packing the still pictures is as described below.
- the audio bit rate is 224k/second.
- the stream_id field can have a value in the range from $C0 to $CB thereby identifying twelve audio streams.
- the total bit rate is calculated as audio bit rate (224k-bit/second) multiply by 12 audio streams to give 2,688,000 bits per second which is within the bit rate for a two-speed CD player. All the sound sub-streams are interlaced to maintain constant CD rotation speed in order to improve play ability of the disc and player.
- the system stream contains one or more normal or high resolution still picture encoded as MPEG video stream, one or more audio channels, and one or more OGT sub- streams.
- the particular method in packing the still pictures is as described below.
- the audio bit rate is 224k-bit/second. Twelve audio streams can be encoded on a track and in the audio packet header field, the stream_id field can be from $C0 to $CB.
- the total bit rate is calculated as audio bit rate (224k/second) multiply by 12 audio streams to give 2,688,000 bits per second, which is within the performance range for a two-speed CD player. All the sound sub-streams are interlaced to maintain constant CD rotation speed in order to improve playability of the disc and player.
- OGT information it is encoded as a single stream with multiple sub-streams, which correspond to the audio streams.
- the sub_stream_id can be from 0 to $FC (or greater), providing a range of 24 (or greater) sub-streams.
- Every OGT packet has its sub_stream_id on the first byte of the data (offset $21) and every OGT page must have a SYNC word at the end of all data and this SYNC word is specified as $04080C10.
- the available total bit rate for OGT is calculated as follows: total CD bit rate minus total audio sub- stream bit rate which is 2,296 bits/second multiply by 75 by 2 by 8 (2,755,200 bits/second) less 2,688,000 bits/second, resulting in 67,200 bits/second.
- the video stream encoding bit rate is made in accordance with the audio channel numbers.
- the normal video bit rate of a system of the present invention can be at 1 ,200,000 bits/second, which allows six (6) audio steams on a single track (224,000x6 bit/second) with a single video stream. For this case, total bit rates are 1,200,000 plus 224,000 multiplied by 6, equaling 2,544,000 bits/second.
- the remaining bandwidth can be used for OGT streams or padding.
- a disc is generally divided into a number of tracks, which is specified by the programmer of the disc.
- a given track there are a number of packs each with its own header and data stream.
- Within each pack there may be a number of packets, again each having a header section identifying the data type and arrangement.
- packs and packets are not the same.
- a pack may contain one or more packets.
- system audio, video, OGT, and padding.
- a pack contains a single packet.
- a pack may contain an audio packet and a padding packet.
- the packs are placed on to a track in accordance with the play order where the packs are interleaved regardless of the packet types.
- each packet is identified by an identification number and all the packs are sequentially read by the player, the player can easily re-assemble all of the packs in accordance with the packet identification number and respective sequence (or timing) numbers.
- the preferred embodiments of the present invention as described above modifies the ranges the stream identification numbers for audio and OGT packets to allow for greater number of channels (or streams) to be identified and therefore played.
- the audio packet identification number is limited to four values and thus limiting the number of audio channels to four channels.
- the identification number for audio packets has been modified to allow up to the speed of the media player divided by the audio bit rate. Each type of media player has its own speed limitations.
- the maximum amount of data that can be read from a compact disc to the player is limited by the speed of the player.
- the bit rate is at 2,724,000 bits per second. Dividing by the audio bit rate of 224,000 bits per second, a 2 speed CD player can theoretically play up to two audio streams in one track. For faster CD players, more audio streams can be placed in a track and played. Theoretically, the above calculation is correct as to the maximum number of audio streams playable for a given speed of a two-speed player, meaning that the user can select any one of the twelve audio streams and have the audio stream played without any problem.
- the reason for the underflow problem has to do with the timing between data read and data played.
- the preferred embodiment of the preferred embodiment of the present invention further modifies the PTS value of a packet.
- the PTS value of a given packet indicates the start of the playtime of a particular packet. For example (in concept only), an audio stream containing a one-minute long son may be sequenced into six (6) packets. The first packet would have a PTS time of 0 th second; the second packet would have a PTS time of 10 th second; the third packet would have a PTS time of 20 th second; and so on. The last packet will have a PTS time of 50 th second.
- a method is devised where the PTS time for the first packet of each audio stream is staggered by a predetermined amount of time. As illustrated, each song is staggered by a certain unit of time. In this situation, if the twelfth song is selected and played, there will a period of silence (equaling to eleven time units) before the playing of the song.
- This time unit of the preferred embodiment is determined by the time that is required to read a pack. For a two-speed CD player, it can read 150 packs per second, equaling to 1/150 of a second. Note that all packs are the same size and a pack is a minimal logical unit of data to be read from a track.
- Fig. 2a illustrates the placement of packs on a track having a still picture and twelve audio streams. Note that all of the video packs (indicated by the symbol "V") can be pre-loaded followed by audio stream packs for audio streams 1 to 12 (Ai to A ⁇ 2 ) and repeating thereafter. Also note that when the maximum amount of audio streams are being encoded, the audio streams have to be coded sequentially as illustrated. If not all twelve audio streams are being encoded, greater latitude can be had in the sequence of the audio packets.
- Fig. 2b illustrate the placement of packs on a track having a still picture, twelve audio streams, and an OGT stream interleaved.
- Fig. 2c illustrates the placement of packs on a track having a video stream encoding a video clip, six audio streams and an OGT stream interleaved. Since there is a video clip, the amount of audio information than can be encoded on a track is reduced. In this example, six audio streams are illustrated.
- the present invention provides a method for encoding additional songs on a track.
- the preferred embodiment described above illustrates a twelve channel (or stream) encoding method for a two-speed CD player thereby allowing at least twelve songs to be encoded for playback on a two-speed CD player.
- two or more songs can be ordered in such a manner so that one song follows another song in the same audio stream. In this manner, there can be more than one song in an audio stream and the limited on the number of songs on a medium is only limited by the capacity of the medium rather than the logical structure of the medium (as the case in prior art methods).
- a command can be provided to direct the read head to the starting location of the targeted song in the track.
- a playback command is provided and it has arguments identifying the particular video stream, the particular audio stream, the particular OGT information, and the start and stop time within the particular audio stream. Appendices A and B provides further details with respect thereto.
- a script language is also provided to enable greater and more dynamic interactive functionality and particularly when use with a file having the file format described above. It allows the performance of simple math calculations, simple character operations, drawing of graphics, display of image files and above-described files, or play sound and video clips. More specifically, the language provides relational operator such as equal to, less than, greater than, less than or equal to, greater than or equal to, and not equal to. It allows multiple statements per line of code, conditional statement (if, then, else), goto statement, gosub and return statement, for loop, and end statements.
- overlay graphics and text is disclosed.
- Overlay graphics and text is specially designed for display of program title graphics and language texts.
- the present preferred method supports full screen, multi-color, and overlay displays, and allows insertion of vocal texts and other still graphical images.
- the advantage is that graphics and text are not needed before video encoding, instead they are merged at decoding time. This flexibility allows language selection and preserves video quality.
- Overlay graphics and text data is packed into OGT special data streams.
- OGT data stream is encoded as a "private stream" as identified in the stream identification field ($BD).
- Its pack structure is the same as a video pack (PS) and packet (PES) with an additional OGT header indicating the sub-stream's identification (beyond 4, for example 0..23) at the beginning of the packet's data.
- PS video pack
- PES packet
- OGT header indicating the sub-stream's identification (beyond 4, for example 0..23) at the beginning of the packet's data.
- One of the sub-streams can be selected accordingly.
- the CHM file has the following general format. An identifying text string, followed by a header and multiple data packets terminated by a private data packet and a closing text string.
- the header contains the information about the authoring tool, its creator and the source material.
- the browser uses the palette information to build a new palette that will be used in the context of the CHM file.
- the data packets contain the data to be used by the browser to navigate the information on the disk.
- a CHM data packet has the following format: A header followed by the data.
- the header contains the type and the size of the packet following the header.
- the type of the CHM data packet The type of the CHM data packet.
- the types are listed in the CHM Data type table, size
- image map name The name of the image map. overlay If the overlay value is ' 1 ' the background image will be preserved and the new image will be drawn on top of the background image. event handlers
- URL length2 The length of the second URL string referring to the overlay URL name excluding the null character URL
- the scripting language ID. Valid ID is 'VCDSCRIPT' length of script
- the script to be executed or parsed.
- the name of the image file to be loaded is a file that can be shared when drawing various text screens.
- SVCD SCRIPT is a simple scripting language, serves as the companion to enable more dynamic and interactive functionality to CHM file. It allows the user to do simple math calculations (such as +-*/ ), simple character operations, draw graphics, display image files/CHM files, or play WAV files and video clips.
- SVCD SCRIPT supports only one kind of data type: integer (INT).
- SVCD SCRIPT supports a maximum of 26 variables. The names of these variables must be a single character from A to Z. Inside an SVCD SCRIPT, all variables are treated as global.
- the maximum number of script lines is 999. Line numbers may not be larger than 65535.
- GOTO is an unconditional jump to another point in the script to continue script execution.
- GOSUB is used for implementing sub-functions within a script by allowing a jump to another point in the script and return script processing to the statement right after the GOSUB statement once the function has been completed via the RETURN statement.
- SVCD SCRIPT is a simple scripting language that serves as a companion to enable more dynamic and interactive functionality to CHM files.
- a SVCD SCRIPT program is composed of a sequence of lines. Each line contains a unique line number that serves as a label for the statement as shown in Figure 1. The line may contain up to 160 characters, although it usually contains considerably fewer.
- Fig.B-1 The general form of a SVCD SCRIPT program
- a SVCD SCRIPT program can be manipulated in 2 ways:
- a pure SVCD SCRIPT program file can be called directly from a CHM file. Please note that all pure SVCD SCRIPT program files should have the extension name CLS. For example:
- a SVCD SCRIPT program can be contained inside of the CHM file.
- scripts are placed between the ⁇ SCRIPT> and ⁇ /SCRIPT> tags, and will always before ⁇ /HEAD> within CHM file.
- the script is then invoked by an Anchor Event, (i.e. OnClick / OnLeave / OnEnter) with a numerical argument indicating the line number to begin execution of the SVCD SCRIPT program.
- an Anchor Event i.e. OnClick / OnLeave / OnEnter
- unrelated blocks of the script code share the same variables and line number space, even though these scripts may have no relationship with each other at all.
- scripts must be carefully written so as not to result in line number and variable conflicts.
- program 1 and program2 are independent scripts, it is highly recommended to initialize all of the variables that will be used in both of these scripts at the beginning of the program.
- the SVCD SCRIPT language supports only 26 single character variables from A to Z, and all of its variables are global variables. As a result, program flow and variable definition should be carefully designed before the programmer before beginning actually script coding.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000587531A JP2004511113A (en) | 1998-12-11 | 1999-12-07 | How to encode multiple audio streams |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US20979298A | 1998-12-11 | 1998-12-11 | |
US09/209,792 | 1998-12-11 |
Publications (3)
Publication Number | Publication Date |
---|---|
WO2000035194A1 WO2000035194A1 (en) | 2000-06-15 |
WO2000035194B1 WO2000035194B1 (en) | 2000-08-17 |
WO2000035194A9 true WO2000035194A9 (en) | 2003-01-23 |
Family
ID=22780299
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1999/029140 WO2000035194A1 (en) | 1998-12-11 | 1999-12-07 | Method for encoding multiple audio streams |
Country Status (2)
Country | Link |
---|---|
JP (1) | JP2004511113A (en) |
WO (1) | WO2000035194A1 (en) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5596564A (en) * | 1993-10-08 | 1997-01-21 | Matsushita Electric Industrial Co., Ltd. | Information recording medium and apparatus and method for recording and reproducing information |
DE69318038T2 (en) * | 1993-10-29 | 1998-10-29 | Toshiba Kawasaki Kk | RECORDING MEDIUM THAT CAN PROCESS DIFFERENT LANGUAGES AND PLAYBACK DEVICE |
EP0788104B1 (en) * | 1995-08-21 | 1999-02-24 | Matsushita Electric Industrial Co., Ltd. | Multimedia optical disk capable of preserving freshness of image content for long time and its reproduction apparatus and method |
-
1999
- 1999-12-07 WO PCT/US1999/029140 patent/WO2000035194A1/en active Application Filing
- 1999-12-07 JP JP2000587531A patent/JP2004511113A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
WO2000035194A1 (en) | 2000-06-15 |
JP2004511113A (en) | 2004-04-08 |
WO2000035194B1 (en) | 2000-08-17 |
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